import Vapor

extension PublicAPI {
    
    var path: PathComponent {
        .init(stringLiteral: rawValue)
    }
    
    var pathParameter: PathComponent {
        .parameter(rawValue)
    }
}

private func keyTransmission(_ req: Request) -> EventLoopFuture<KeyResult> {
    guard let keyId = req.parameters.get(PublicAPI.postKeyIdParameter.rawValue, as: UInt16.self) else {
        return req.eventLoop.makeSucceededFuture(.invalidKeyIndex)
    }
    guard let body = req.body.data else {
        return req.eventLoop.makeSucceededFuture(.noBodyData)
    }
    guard body.readableBytes == KeyManagement.keySize else {
        return req.eventLoop.makeSucceededFuture(.invalidPayloadSize)
    }
    guard let key = body.getData(at: 0, length: KeyManagement.keySize) else {
        return req.eventLoop.makeSucceededFuture(.corruptkeyData)
    }
    return keyManager.sendKeyToDevice(key, keyId: keyId, on: req.eventLoop)
}

func routes(_ app: Application) throws {
    
    /**
     Get the connection status of the device.
     
     The response is a string of either "1" (connected) or "0" (disconnected)
     */
    app.get(PublicAPI.getDeviceStatus.path) { req -> String in
        keyManager.deviceStatus
    }
    
    /**
     Get the response from the device.
     
     The response is a string of an integer `rawValue` of a `KeyResult`
     */
    app.get(PublicAPI.getDeviceResponse.path) { req -> String in
        keyManager.deviceResponse
    }
    
    /**
     Post a request to remove the information about the last key transmission.
     
     - The request always succeeds and returns the string "Success"
     */
    app.post(PublicAPI.clearKeyRequest.path) { req -> String in
        keyManager.clearClientRequest()
        return "Success"
    }
    
    
    /**
     Post a key to the device for unlocking.
     
     The corresponding integer key id for the key data must be contained in the url path.
     
     The request returns a string containing a `rawValue` of a `KeyPostResponse`
     A success of this method does not yet signal successful unlocking.
     The client should request the status by inquiring the device response.
     */
    app.post(PublicAPI.postKey.path, PublicAPI.postKeyIdParameter.pathParameter) { req in
        keyTransmission(req).map { String($0.rawValue) }
    }
    
    /**
     Start a new websocket connection for the client to receive table updates from the server
     - Returns: Nothing
     - Note: The first (and only) message from the client over the connection must be a valid session token.
     */
    app.webSocket(PublicAPI.socket.path) { req, socket in
        socket.onBinary { _, data in
            keyManager.processDeviceResponse(data)
        }
        socket.onText { _, text in
            keyManager.authenticateDevice(psk: text)
        }
        
        _ = socket.onClose.always { _ in
            keyManager.didCloseDeviceSocket()
        }
        keyManager.createNewDeviceConnection(socket)
    }
}